Have you read this recently published article? "Communication is a game development skill".
It contains some useful information, especially if you're planning to discuss your concepts after explaining it.
In addition to the above:
- Use standardised/common terminology rather than making up your own terms when possible. Try to avoid using a commonly understood term in a way that is different than normal, as this will confuse people.
- Take the time to explain any unusual terminology.
- If you're having a forum discussion and need to add additional information or correct something after others have responded it's often better to add your corrections or new information in a new post rather than editing an older post, as editing the older post can sometimes make the conversation difficult to follow.
Hope that helps!